A clamp meter is a clothespin-shaped instrument that can be clamped around a live wire in order to measure the current it's carrying . As a measurement principle, clamp meters detect the magnetic field emitted by current flowing in a wire in order to measure the current value. Features: Auto/manual ranging True RMS, self-calibrated chip, high accuracy 550V overload protection (μA Mode excluded） 6000 counts 12 test modes Large LCD screen with white backlight Data hold, auto power-off Measure AC current up to 1000A Measure temperature One-year warranty Two AAA batteries, easier to change Specifications: Display (LCD) 6000 count Ranging Auto/Manual Material ABS Update Rate 3 times/second True RMS √ Data Hold √ Backlight √ Low Battery Indication √ Auto Power Off √ Mechanical Specifications: Dimension 240*90*45mm Weight (batteries included) 352g(VC902) 325g(VC903) Battery Type 1.5V AA Battery * 2 (VC902) 9V 6F22 Battery * 1 (VC903) Warranty One year Package Include: 1 x VC-903 handheld digital clamp meter auto range MAX AC and DC current